Add debug logging to auth status endpoint

🔍 Debug additions:
- Add logging to auth status endpoint to track user data
- Log user from request.state and session
- This will help identify why authenticated users appear as anonymous

Next step: Check HF logs to see what's happening with session data.

backend/routers/auth.py

@@ -29,10 +29,14 @@ async def auth_status(request: Request):
     """Get authentication status and configuration."""
     config = get_oauth_config()
     user = getattr(request.state, "user", None)
+    logger.info(f"🔍 Auth status check - user from request.state: {user}")
+    
     if not user:
         try:
             user = request.session.get("user")
-        except (AttributeError, AssertionError):
+            logger.info(f"🔍 Auth status check - user from session: {user}")
+        except (AttributeError, AssertionError) as e:
+            logger.warning(f"🔍 Auth status check - session access failed: {e}")
             user = None
     
     return {